Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 

Improvements to oxidation ponds well underway


Improvements to oxidation ponds well underway

Improvements to the oxidation ponds at the Christchurch Wastewater Treatment Plant are progressing steadily, with Pond 2 out of service while an earth wall is constructed to divide the pond in two.

The pond is also being deepened and reshaped, and its banks strengthened to reduce the potential for failure in a major earthquake.

Mike Bourke, the Council’s City Water and Waste Operations and Maintenance Manager says the upgrade will improve the pattern of flow through the pond.

“Construction of the dividing wall is well under way and the contractor will soon be stabilising this embankment to reduce the potential for wind blown sand to cause a nuisance.

“The contractor is flooding areas where deepening has been completed to again reduce the potential for sand to blow off the site,” says Mr Bourke.

Work is also being done on the pipe connections between the ponds. Part of this work will involve draining Pond 3, the small pond east of Dyers Road, to enable the construction of connecting pipe work.

“We’re taking this opportunity to deepen and reshape Pond 3, and to construct an island to enhance the wildlife habitat,” says Mr Bourke.

The upgrade of the ponds will change how the flow moves through the pond system and provide significant improvement to the wastewater quality before discharge.

Currently the flow passes through three ponds in series before it is discharged to the estuary. When the pond upgrade is completed in mid-2004 the flow will pass through seven ponds in series, and produce an effluent quality that is expected to be some 10 times better than the current discharge.

“This improved, natural disinfection is achieved by reducing the flow’s short circuit from the inlet to the outlet of each pond and maximising the time the flow takes to pass through all the ponds. Computer modelling of the pond system, coupled with salt tracer testing, has been used to predict the improvements and to determine the optimum shape and depth,” says Mr Bourke.

The first stage of the upgrade, which involved deepening and reshaping Pond 1, was completed in May this year.

Notes:

The upgrades to the oxidation ponds are linked to other upgrades around the city to improve the quality of treated wastewater, better protect the environment and ensure the entire wastewater system will cope with expected city growth, including:

treatment plant improvements; the major sewer upgrade - a $36 million, 10-year project which involves the laying of more than 30km of new pipe; the Ocean Outfall pipeline.

© Scoop Media

 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

Decision Day: Peters Chooses Labour

Winston Peters says he will form a Government in coalition with Labour and the Greens giving confidence and supply.

Peters said he had been offered the position of Deputy Prime Minister and a number of other ministerial posts would go to his colleagues

He said economic and monetary policy changes were needed to face a coming economic downturn.>>>More

Reaction

Labour on its agreement |Peters: Post-Election Announcement Speech | Greenpeace “cautiously hopeful” about new Government | ACT - Madman on the loose | E tū ecstatic | Chamber welcomes the outcome

 

Climate: Increasing Greenhouse Emissions Hit NZ

New Zealand is seeing impacts of excess greenhouse gas emissions in our climate and oceans, according to the latest national report from the Ministry for the Environment and Stats NZ about the state of the atmosphere and climate…More>>

ALSO:


Wellington.Scoop: Arrests At Blockade Of "Weapons Expo"

“We encourage people in Wellington to get down to the Westpac Stadium now for a day of awesome peace action. There will be plenty of food, music and activities to keep us sustained through the day.” More>>

ALSO:

Rorschach Restructuring: PSA Taking Inland Revenue To Court Over Psychometrics

The Public Service Association will be seeing Inland Revenue in Employment Court over its intention to psychometrically test employees reapplying for their roles at the department as part of its controversial Business Transformation restructuring plan. More>>

ALSO:

Nuclear Disarmament: Nobel Peace Prize 2017 Awarded To ICAN

Congratulations from iCAN Aotearoa New Zealand to international iCAN, the other iCAN national campaigns and partner organisations, and the countless organisations and individuals who have worked so hard for a nuclear weapons-free world since 1945. More>>

ALSO:

Expenses: Waikato DHB CEO Resigns

An independent inquiry has identified that Dr Murray had spent more than the agreed $25K allocated for relocation costs, and other unauthorized expenses involving potential financial breaches of the chief executive’s obligations. More>>

ALSO:

Wellington.Scoop: Sad About The Trolley Buses?

The Regional Council’s MetLink is today spending money to tell us that it really loves Wellington’s trolley buses, even though they’re all being taken off our roads by the end of this month. More>>

ALSO:

Post-Election: Preliminary Coalition Talks Begin

New Zealand First will hold post-election preliminary discussions in Wellington with the National Party tomorrow morning and the Labour Party tomorrow afternoon. More>>

 
 
 
 
 

LATEST HEADLINES

  • PARLIAMENT
  • POLITICS
  • REGIONAL
 
 

Featured InfoPages

Opening the Election